Add whole milk powder and vanilla extract and mix until a dough forms. Keep kneading the candy dough until all ingredients are well incorporated.
On a clean surface, roll out the candy into a long rope. It's okay if you need to divide into 2-4 ropes to fit on your surface.
With a knife or pastry cutter, slice into candy-sized pieces. You can eat the candy right away or wrap each piece individually in cling film (see blog post above for quick ways to wrap candy) for gifting. Candy can sit at room temperature, but I recommend keeping in the fridge to keep the candy from getting too soft.
Notes
Maltose is common in Chinese baking and is like a much more viscous and less sweet honey or corn starch. I could find maltose easily at our local Asian grocery store. If you can't find maltose or don't want to add another ingredient to your pantry, you can substitute honey, but omit the added sugar as honey is more sweet. Your candy may be softer at room temperature than if you used maltose.